Hey there, I bought a 93 XR2 a few months ago and its in the process of a very thorough tune up. I plan on getting a rocketchip in the future but as for now i'm wondering what I can do or should do with the fuel injectors. I'm not even sure what size injectors the XR2 has? I figured i'd ask somebody like you guys with great experience before I start throwing money at it. And i'm new here so if i'm doing something wrong, or not doing something let me know! lol Thanks in advance - Braden

[If your wideband is showing very lean under load] - what's this mean?

Your car has an oxygen sensor. It tells the computer roughly how much fresh unburned oxygen is left in the exhaust. (air/fuel ratio) It uses this as a feedback sensor to trim the fuel injection while you're cruising on the highway or other constant speeds/loads under "closed loop" mode. This maximizes MPG.

There are aftermarket sensors called "WideBand O2" systems that are more accurate, and tell EXACT air/fuel ratios to you. (the stock sensors are "Narrowband" and are only accurate in a very small part of the AFR range) If you are showing LEAN under load (excess oxygen in the exhaust) this means that your fuel system is maxxed out & unable to keep up with the airflow your engine is capable of.

Your engine is essentially an air pump. Make it pump more air = more power. Install a better camshaft with performance oriented timing/overlap/lift. Install an exhaust header. Port & polish the heads. Install oversize valves. Increase the static compression. Balance the rotating assembly to let it rev higher. All of these things can increase airflow. On a nonturbo engine, the $$ bill adds up quickly.

Installing & tuning an aftermarket fuel injection computer will allow you to do this. Megasquirt is a very popular one. There are others. They can work with the stock distributor, but the distributor system is archaic and lossy compared to today's systems. You'll need to replace the distributor with a coilpack & appropriate sensors such as an optical CAS (available from the Miata) or add a trigger wheel & VR sensor to the crankshaft pulley, such as used in the Ford EDIS-4 systems. Then tell the ECU what you have, with the appropriate settings, and all will play nicely together

Sorry if these are over your head, these are the basics. Googling the above terms & systems will be able to shed more light than I am able to

I saw on YouTube there is a guy that used an evo8 turbo (Which I assume is a 16G), and I'm going to be doing this eventually. Assuming I will be using Megasquirt for tuning purposes, which injectors would y'all recommend? Alternatively, would a rocketchip suffice with larger injectors, FPR, and all the supporting mods with a 16G?

I have had a lot of customers run a 16G with the Rocketchip. You will need to run a Wideband O2 and monitor AFRs closely while slowly increasing boost until you find the limits of the stock fuel system.

You can check an injector calculator for the optimal flowrate for your hp goals on the Megasquirt system, they'll likely be in the 450-500cc range. There are countless injectors both from other cars and aftermarket that will fit the bill

Everyone's setup is vastly different, and not too many of the folks here have pressed that far with the Capri. You might want to check out the forum archives on ClubProtege and FordFestiva - there have been many high power B6T's swapped that may provide a starting point for your setup.